<template>
  <div>
       <!-- 面包屑导航区域 -->
       <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row :class="['vbottom']">
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <el-table :data='roleList' border stripe>
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row v-for="(item1,i1) in scope.row.children" :key='item1.id' :class="['bdbottom',i1 === 0 ? 'bddtop' : '','vcenter']">
                            <!-- 渲染以及权限 -->
                            <el-col :span='5'>
                                <el-tag closable @close='removeRightById(scpe.row,item1.id)'>{{ item1.authName }}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级或者三级权限 -->
                            <el-col :span='19'>
                                <!-- 通过for循环嵌套渲染二级权限 -->
                                <el-row v-for="(item2,i2) in item1.children" :key='item2.id' :class="[i2 === 0 ? '' : 'bdtop','vcenter']">
                                    <el-col :span='6'>
                                        <el-tag type="success" closable @close='removeRightById(scpe.row,item2.id)'>{{ item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 循环渲染三级权限 -->
                                    <el-col :span='18'>
                                        <el-tag v-for="(item3,i3) in item2.children" :key='item3.id' type="warning" closable @close='removeRightById(scpe.row,item3.id)'>
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <pre>

                        </pre>
                    </template>
                </el-table-column>
                <el-table-column type="index" label="#"></el-table-column>
                <el-table-column prop="roleName" label='角色名称'></el-table-column>
                <el-table-column prop="roleDesc" label='角色描述'></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                        <el-button type="warning" icon="el-icon-setting" size="mini" @click='showSetRightDialog(scope.row)'>分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialog"
            width="50%"
            @close='setRightDialogClosed'

            >
            <!-- 这是树形控件 -->
            <el-tree :data="rightsList" :props="defaultProps" show-checkbox node-key="id"
            default-expand-all
            :default-checked-keys="defKeys"
             ref='treeRef'></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialog = false">取 消</el-button>
                <el-button type="primary" @click="allotRight">确 定</el-button>
            </span>
        </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      roleList: [],
      setRightDialog: false, // 控制分配权限对话框显示与隐藏
      rightsList: [], // 所有权限的数据
      defaultProps: {
        label: 'authName',
        children: 'children'
      },
      defKeys: [], // 默认选中的节点数组
      roleId: '' // 当i去哪即将分配权限的id
    }
  },
  created () {
    this.getRoleList()
  },
  methods: {
    async getRoleList () {
      const { data: res } = await this.$http.get('/roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.roleList = res.data
    },
    // 根据id删除对应权限
    async removeRightById (role, rightId) {
      const result = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (result !== 'confirm') {
        return this.$message.info('取消删除')
      }
      const { data: res } = await this.$http.delete(`/roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败!')
      }
      role.children = res.data
    },
    // 这是展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限数据
      const { data: res } = await this.$http.get('/rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      // 把获取到的数据存储到rightsList中
      this.rightsList = res.data
      // 递归获取三级权限id
      this.getleafKeys(role, this.defKeys)
      this.setRightDialog = true
    },
    // 通过递归的形式，获取角色下所有的三级权限
    getleafKeys (node, arr) {
      // 如果当前node节点不包含属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getleafKeys(item, arr)
      })
    },
    // 监听分配权限对话框关闭事件
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRight () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(`/roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('更新权限失败!')
      }
      this.$message.success('更新数据成功')
      this.getRoleList()
      this.setRightDialog = false
    }
  }
}
</script>

<style lang="less" scoped>
    .bdtop{
        border-top:1px solid #eee
    }
    .bdbottom{
        border-bottom:1px solid #eee
    }
    .el-tag{
        margin: 7px;
    }
    .vcenter{
        display: flex;
        align-items: center;
    }
    .vbottom{
        margin-bottom: 10px;
    }
</style>
